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1. Distributed, Concurrent, and Independent Access to
Encrypted Cloud Databases
ABSTRACT:
Placing critical data in the hands of a cloud provider should come with the
guarantee of security and availability for data at rest, in motion, and in use. Several
alternatives exist for storage services, while data confidentiality solutions for the
database as a service paradigm are still immature. We propose a novel architecture
that integrates cloud database services with data confidentiality and the possibility
of executing concurrent operations on encrypted data. This is th first solution
supporting geographically distributed clients to connect directly to an encrypted
cloud database, and to execute concurrent and independent operations including
those modifying the database structure. The proposed architecture has the further
advantage of eliminating intermediate proxies that limit the elasticity, availability,
and scalability properties that are intrinsic in cloud-based solutions. The efficacy of
the proposed architecture is evaluated through theoretical analyses and extensive
experimental results based on a prototype implementation subject to the TPC-C
standard benchmark for different numbers of clients and network latencies.

2. EXISTING SYSTEM:
Original plain data must be accessible only by trusted parties that do not
include cloud providers, intermediaries, and Internet; in any untrusted context, data
must be encrypted. Satisfying these goals has different levels of complexity
depending on the type of cloud service. There are several solutions ensuring
confidentiality for the storage as a service paradigm, while guaranteeing
confidentiality in the database as a service (DBaaS) paradigm is still an open
research area.
DISADVANTAGES OF EXISTING SYSTEM:
 Cannot apply fully homomorphic encryption schemes because of their
excessive computational complexity.
PROPOSED SYSTEM:
 We propose a novel architecture that integrates cloud database services with
data confidentiality and the possibility of executing concurrent operations on
encrypted data.
 This is the first solution supporting geographically distributed clients to
connect directly to an encrypted cloud database, and to execute concurrent

3. and independent operations including those modifying the database
structure.
 The proposed architecture has the further advantage of eliminating
intermediate proxies that limit the elasticity, availability, and scalability
properties that are intrinsic in cloud-based solutions.
 Secure DBaaS provides several original features that differentiate it from
previous work in the field of security for remote database services.
ADVANTAGES OF PROPOSED SYSTEM:
 The proposed architecture does not require modifications to the cloud
database, and it is immediately applicable to existing cloud DBaaS, such as
the experimented PostgreSQL Plus Cloud Database, Windows Azure and
Xeround .
 There are no theoretical and practical limits to extend our solution to other
platforms and to include new encryption algorithm.

4.  It guarantees data confidentiality by allowing a cloud database server to
execute concurrent SQL operations (not only read/write, but also
modifications to the database structure) over encrypted data.
 It provides the same availability, elasticity, and scalability of the original
cloud DBaaS because it does not require any intermediate server.

5. SYSTEM ARCHITECTURE:
SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
 System : Pentium IV 2.4 GHz.
 Hard Disk : 40 GB.
 Floppy Drive : 1.44 Mb.

6.  Monitor : 15 VGA Colour.
 Mouse : Logitech.
 Ram : 512 Mb.
SOFTWARE REQUIREMENTS:
 Operating system : Windows XP/7.
 Coding Language : ASP.net, C#.net
 Tool : Visual Studio 2010
 Database : SQL SERVER 2008
REFERENCE:
Luca Ferretti, Michele Colajanni, and Mirco Marchetti, “Distributed,
Concurrent, and Independent Access to Encrypted Cloud Databases”, VOL.
25, NO. 2, FEBRUARY 2014.